/*
  * R3D REDCODE demuxer
  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/intreadwrite.h"

 #include "libavutil/dict.h"

 #include "libavutil/mathematics.h"

 #include "avformat.h"

 #include "internal.h"

 
 typedef struct {
     unsigned video_offsets_count;
     unsigned *video_offsets;
     unsigned rdvo_offset;
 } R3DContext;
 
 typedef struct {
     unsigned size;
     uint32_t tag;
     uint64_t offset;
 } Atom;
 
 static int read_atom(AVFormatContext *s, Atom *atom)
 {

     atom->offset = avio_tell(s->pb);

     atom->size = avio_rb32(s->pb);

     if (atom->size < 8)
         return -1;

     atom->tag = avio_rl32(s->pb);

     av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",

             atom->size, (char*)&atom->tag, atom->offset);
     return atom->size;
 }
 
 static int r3d_read_red1(AVFormatContext *s)
 {

     AVStream *st = avformat_new_stream(s, NULL);

     char filename[258];

     int tmp;
     int av_unused tmp2;

     AVRational framerate;

 
     if (!st)

         return AVERROR(ENOMEM);

     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

     st->codec->codec_id = AV_CODEC_ID_JPEG2000;

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version

     av_dlog(s, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb16(s->pb); // unknown

     av_dlog(s, "unknown1 %d\n", tmp);

     tmp = avio_rb32(s->pb);

     avpriv_set_pts_info(st, 32, 1, tmp);

     tmp = avio_rb32(s->pb); // filenum

     av_dlog(s, "filenum %d\n", tmp);

     avio_skip(s->pb, 32); // unknown

     st->codec->width  = avio_rb32(s->pb);
     st->codec->height = avio_rb32(s->pb);

     tmp = avio_rb16(s->pb); // unknown

     av_dlog(s, "unknown2 %d\n", tmp);

     framerate.num = avio_rb16(s->pb);
     framerate.den = avio_rb16(s->pb);

     if (framerate.num > 0 && framerate.den > 0) {

 #if FF_API_R_FRAME_RATE
         st->r_frame_rate =
 #endif
         st->avg_frame_rate = framerate;
     }

     tmp = avio_r8(s->pb); // audio channels

     av_dlog(s, "audio channels %d\n", tmp);

     if (tmp > 0) {

         AVStream *ast = avformat_new_stream(s, NULL);

         if (!ast)
             return AVERROR(ENOMEM);

         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

         ast->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

         ast->codec->channels = tmp;

         avpriv_set_pts_info(ast, 32, 1, st->time_base.den);

     }
 

     avio_read(s->pb, filename, 257);

     filename[sizeof(filename)-1] = 0;

     av_dict_set(&st->metadata, "filename", filename, 0);

     av_dlog(s, "filename %s\n", filename);
     av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
     av_dlog(s, "timescale %d\n", st->time_base.den);
     av_dlog(s, "frame rate %d/%d\n",

             framerate.num, framerate.den);

 
     return 0;
 }
 
 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
 {
     R3DContext *r3d = s->priv_data;
     AVStream *st = s->streams[0];
     int i;
 
     r3d->video_offsets_count = (atom->size - 8) / 4;
     r3d->video_offsets = av_malloc(atom->size);
     if (!r3d->video_offsets)
         return AVERROR(ENOMEM);
 
     for (i = 0; i < r3d->video_offsets_count; i++) {

         r3d->video_offsets[i] = avio_rb32(s->pb);

         if (!r3d->video_offsets[i]) {
             r3d->video_offsets_count = i;
             break;
         }

         av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);

     }
 

     if (st->avg_frame_rate.num)

         st->duration = av_rescale_q(r3d->video_offsets_count,

                                     av_inv_q(st->avg_frame_rate),

                                     st->time_base);

     av_dlog(s, "duration %"PRId64"\n", st->duration);

 
     return 0;
 }
 
 static void r3d_read_reos(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;

     int av_unused tmp;

     r3d->rdvo_offset = avio_rb32(s->pb);
     avio_rb32(s->pb); // rdvs offset
     avio_rb32(s->pb); // rdao offset
     avio_rb32(s->pb); // rdas offset

     tmp = avio_rb32(s->pb);

     av_dlog(s, "num video chunks %d\n", tmp);

     tmp = avio_rb32(s->pb);

     av_dlog(s, "num audio chunks %d\n", tmp);

     avio_skip(s->pb, 6*4);

 }
 

 static int r3d_read_header(AVFormatContext *s)

 {
     R3DContext *r3d = s->priv_data;
     Atom atom;
     int ret;
 
     if (read_atom(s, &atom) < 0) {
         av_log(s, AV_LOG_ERROR, "error reading atom\n");
         return -1;
     }
     if (atom.tag == MKTAG('R','E','D','1')) {
         if ((ret = r3d_read_red1(s)) < 0) {
             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
             return ret;
         }
     } else {
         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
         return -1;
     }
 

     s->data_offset = avio_tell(s->pb);

     av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);

     if (!s->pb->seekable)

         return 0;
     // find REOB/REOF/REOS to load index

     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);

     if (read_atom(s, &atom) < 0)
         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
 
     if (atom.tag != MKTAG('R','E','O','B') &&
         atom.tag != MKTAG('R','E','O','F') &&
         atom.tag != MKTAG('R','E','O','S'))
         goto out;
 
     r3d_read_reos(s);
 
     if (r3d->rdvo_offset) {

         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);

         if (read_atom(s, &atom) < 0)
             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
         if (atom.tag == MKTAG('R','D','V','O')) {
             if (r3d_read_rdvo(s, &atom) < 0)
                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
         }
     }
 
  out:

     avio_seek(s->pb, s->data_offset, SEEK_SET);

     return 0;
 }
 
 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     AVStream *st = s->streams[0];

     int tmp;
     int av_unused tmp2;

     uint64_t pos = avio_tell(s->pb);

     unsigned dts;

     int ret;

     dts = avio_rb32(s->pb);

     tmp = avio_rb32(s->pb);

     av_dlog(s, "frame num %d\n", tmp);

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version

     av_dlog(s, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb16(s->pb); // unknown

     av_dlog(s, "unknown %d\n", tmp);

 
     if (tmp > 4) {

         tmp = avio_rb16(s->pb); // unknown

         av_dlog(s, "unknown %d\n", tmp);

         tmp = avio_rb16(s->pb); // unknown

         av_dlog(s, "unknown %d\n", tmp);

         tmp = avio_rb32(s->pb);

         av_dlog(s, "width %d\n", tmp);

         tmp = avio_rb32(s->pb);

         av_dlog(s, "height %d\n", tmp);

         tmp = avio_rb32(s->pb);

         av_dlog(s, "metadata len %d\n", tmp);

     }

     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);

     if (tmp < 0)
         return -1;

     ret = av_get_packet(s->pb, pkt, tmp);
     if (ret < 0) {

         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
         return -1;
     }
 
     pkt->stream_index = 0;
     pkt->dts = dts;

     if (st->avg_frame_rate.num)

         pkt->duration = (uint64_t)st->time_base.den*

             st->avg_frame_rate.den/st->avg_frame_rate.num;

     av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);

 
     return 0;
 }
 
 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     AVStream *st = s->streams[1];

     int av_unused tmp, tmp2;
     int samples, size;

     uint64_t pos = avio_tell(s->pb);

     unsigned dts;

     int ret;

     dts = avio_rb32(s->pb);

     st->codec->sample_rate = avio_rb32(s->pb);

     if (st->codec->sample_rate <= 0) {
         av_log(s, AV_LOG_ERROR, "Bad sample rate\n");

         return AVERROR_INVALIDDATA;
     }

     samples = avio_rb32(s->pb);

     tmp = avio_rb32(s->pb);

     av_dlog(s, "packet num %d\n", tmp);

     tmp = avio_rb16(s->pb); // unknown

     av_dlog(s, "unknown %d\n", tmp);

     tmp  = avio_r8(s->pb); // major version
     tmp2 = avio_r8(s->pb); // minor version

     av_dlog(s, "version %d.%d\n", tmp, tmp2);

     tmp = avio_rb32(s->pb); // unknown

     av_dlog(s, "unknown %d\n", tmp);

     size = atom->size - 8 - (avio_tell(s->pb) - pos);

     if (size < 0)
         return -1;

     ret = av_get_packet(s->pb, pkt, size);
     if (ret < 0) {
         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
         return ret;

     }
 
     pkt->stream_index = 1;
     pkt->dts = dts;

     if (st->codec->sample_rate)
         pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);

     av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",

             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
 
     return 0;
 }
 
 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     Atom atom;
     int err = 0;
 
     while (!err) {
         if (read_atom(s, &atom) < 0) {
             err = -1;
             break;
         }
         switch (atom.tag) {
         case MKTAG('R','E','D','V'):
             if (s->streams[0]->discard == AVDISCARD_ALL)
                 goto skip;
             if (!(err = r3d_read_redv(s, pkt, &atom)))
                 return 0;
             break;
         case MKTAG('R','E','D','A'):
             if (s->nb_streams < 2)
                 return -1;
             if (s->streams[1]->discard == AVDISCARD_ALL)
                 goto skip;
             if (!(err = r3d_read_reda(s, pkt, &atom)))
                 return 0;
             break;
         default:
         skip:

             avio_skip(s->pb, atom.size-8);

         }
     }
     return err;
 }
 
 static int r3d_probe(AVProbeData *p)
 {
     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 {
     AVStream *st = s->streams[0]; // video stream
     R3DContext *r3d = s->priv_data;
     int frame_num;
 

     if (!st->avg_frame_rate.num)

         return -1;
 

     frame_num = av_rescale_q(sample_time, st->time_base,

                              av_inv_q(st->avg_frame_rate));

     av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
             frame_num, sample_time);

 
     if (frame_num < r3d->video_offsets_count) {

         if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
             return -1;

     } else {
         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
         return -1;
     }
 
     return 0;
 }
 
 static int r3d_close(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;
 
     av_freep(&r3d->video_offsets);
 
     return 0;
 }
 

 AVInputFormat ff_r3d_demuxer = {

     .name           = "r3d",

     .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D"),

     .priv_data_size = sizeof(R3DContext),
     .read_probe     = r3d_probe,
     .read_header    = r3d_read_header,
     .read_packet    = r3d_read_packet,
     .read_close     = r3d_close,
     .read_seek      = r3d_seek,

 };